阿铭Linux

shell习题-判断日期是否合法

用shell脚本判断输入的日期是否合法。就是判断日期是都是真实的日期，比如20170110就是合法日期，20171332就不合法。

参考答案：

#!/bin/bash

#check date

if [ $# -ne 1 ] || [ ${#1} -ne 8 ]
then
    echo "Usage: bash $0 yyyymmdd"
    exit 1
fi

datem=$1
year=${datem:0:4}
month=${datem:4:2}
day=${datem:6:2}

if echo $day|grep -q '^0'
then
    day=`echo $day |sed 's/^0//'`
fi

if cal $month $year >/dev/null 2>/dev/null
then
    daym=`cal $month $year|egrep -v "$year|Su"|grep -w "$day"`
    if [ "$daym" != "" ]
    then
        echo ok
    else
        echo "Error: Please input a wright date."
    exit 1
    fi
else
    echo "Error: Please input a wright date."
    exit 1
fi